46 results about "Stack effect" patented technology

The invention provides an elevator sterilizing, ventilating and air-conditioning system and an operation method thereof. The system comprises a power unit, a semiconductor air-conditioning unit, a sterilizing unit, a ventilating unit, a monitoring unit and a control display unit. According to the system, wind power generation is provided through elevator shaft piston wind and the chimney effect during elevator running, cold and heat supply is provided for air in an elevator shaft through the semiconductor refrigerating and heating technology, and meanwhile an elevator car sterilizing, ventilating and filtering device is provided. The invention further provides a method of the sterilizing, ventilating and air-conditioning system for the elevator, normal and efficient work of the system can be guaranteed, multiple functions of ventilating, sterilizing, refrigerating, heating and air conditioning are integrated, meanwhile, the running resistance of the elevator is effectively reduced, and the chimney effect in an elevator shaft can be effectively relieved. In addition, the user can sense real-time air quality data and the number of users of the elevator, the use requirements of the user can be conveniently adjusted, and the high engineering practice value is achieved.

A support is provided with a hollow-out structure used for forming air circulation in the horizontal direction, a shielding body comprises an outer plate and an inner plate, the outer plate is arranged on the support, the vertical projection of the outer plate at least covers equipment, and the outer plate inclines towards the periphery of the outer plate along the vertex position of the middle of the outer plate. An air outlet is formed in the upper portion of the outer plate, multiple air inlets are formed in the lower portion of the outer plate, the inner plate is arranged on the support, or a top cavity is formed in the lower end face of the outer plate, and the air inlets are communicated with the top cavity. The outer plate can achieve the rain shielding function, the air inlet holes and the air outlet holes in the outer plate and the top cavity form an air channel, air can enter from the air inlet holes and then conduct heat transfer with the upper end face of the inner plate, then the air is exhausted from the air outlet holes, and cooling of the inner plate is achieved. The self-cooling structure with the flow guide function continuously cools the shielding body through the chimney effect of hot air, is simple in structure, safe and reliable, and can avoid high-temperature damage.

The invention discloses a house air conditioner control system combined with a passive energy-saving mechanism, and particularly relates to the field of energy conservation and air conditioner control, which comprises an acquisition and analysis module, an over-limit air supply module, a fallback shutdown module, a dynamic heat release module and a coordination switching module, the collection and analysis module collects indoor temperature data at an indoor air outlet and underground air temperature and humidity data at an underground fresh air inlet, and combines the collected data with a historical temperature curve and a solar radiation change trend to generate a trend analysis result. Solving a prediction result of room temperature future overrun or falling based on a trend analysis result; according to the scheme, by introducing trend prediction and judgment logic and combining passive adjustment paths of underground air circulation, the phase change heat storage unit and the chimney effect, collaborative operation of feed-forward control and feedback correction is achieved in all the modules, and the problems of adjustment delay and energy consumption amplification caused by sensing delay and execution inertia are solved.

The invention discloses a modular electromechanical pipeline roof crossing protection device and a construction method, the modular electromechanical pipeline roof crossing protection device comprises a fixed base, a concrete structure floor and a roof layer, the fixed base is pre-buried in the concrete structure floor and the roof layer, and a water stop wing ring is arranged on the periphery of the fixed base; the protective outer cylinder is fixedly connected with the fixed base, the protective outer cylinder is provided with an outwards-turned flange edge, a valve is arranged in the middle of the protective outer cylinder, and the valve is connected with the side wall of the protective outer cylinder through a fastening assembly. The fireproof plugging module is arranged on the inner side wall of the fixed base; the outer side of the fixed base is fixedly connected with the heat preservation outer sleeve. The fireproof plugging module capable of being pulled, inserted and replaced is arranged, the excellent fireproof performance is achieved, the module is formed by compounding a ceramic fiber felt, an expanded graphite strip and fireproof glue or is composed of rock wool, fireproof mud and a fireproof bag according to different pipeline types, reliable fireproof plugging is ensured, and the chimney effect in a fire disaster is effectively prevented.

The utility model discloses a heat dissipation device, and the device comprises a radiator which comprises a plurality of cooling fins which are arranged at intervals, and a gap between every two adjacent cooling fins forms an air inlet channel; and the air outlet component is arranged above the cooling fins and is provided with an air outlet channel communicated with the opening in the upper side of the air inlet channel, so that air which enters the air inlet channel and exchanges heat with the cooling fins can flow out upwards from the air outlet channel. According to the heat dissipation device, the radiator and the air outlet component are combined, the chimney effect for strengthening natural convection is formed, high-temperature air in the radiator can only move upwards through the fixed air outlet channel, supplementary airflow can only be supplemented to the middle through the two sides of the radiator, and therefore the pressure difference between a high-pressure area and a low-pressure area is guaranteed; the heat dissipation device is high in air entrainment capacity, the air flow speed is higher, and heat dissipation can be efficiently and rapidly carried out on the component to be subjected to heat dissipation.

A light fixture that utilize multiple sheets of MCPCB for reduced costs, weight, and thermal, mechanical, and / or optical controls. In other embodiments, a heat sink may be formed by extruding a block of material to form a heat sink that utilizes a venturi and chimney effect, which may include attached MCPCB. Specific embodiments may utilize a plurality of MCPCB sheets or other pliable materials, which may be mirrored over a central axis or an extruded heat sink to create an open upper surface with a chimney effect

The present invention discloses a novel building structure and control method for alleviating the chimney effect of high-rise buildings. The structure relates to the fields of building technology and elevators, and includes a pressure relief shaft, a one-way airflow channel, a pressure relief mechanism, a monitoring system, and an intelligent control system. The pressure relief shaft is arranged on one side of the elevator shaft, the one-way airflow channel is arranged on the top and bottom floors of the pressure relief channel, the pressure relief shaft is connected to the elevator shaft through the one-way airflow channel, the pressure relief mechanism is respectively arranged above the pressure relief shaft and the elevator hall door, and the monitoring system includes a pressure plate, an indoor thermometer, and an outdoor thermometer. The pressure plates are arranged on both sides of the elevator hall door, the indoor thermometers are evenly arranged in the elevator shaft, and the outdoor thermometer is arranged on the outer wall of the building. The pressure relief mechanism, the pressure plate, the indoor thermometer, and the outdoor thermometer are all electrically connected to the intelligent control system. The present invention can reduce the impact of the chimney effect on elevator operation and ensure the smooth operation of the elevator.

The invention discloses a smoke-proof device for an elevator hall of a refuge floor and a using method of the smoke-proof device, the smoke-proof device comprises a door-shaped sealing frame, a roller shutter assembly, a driving motor and a transmission assembly, the roller shutter assembly comprises a rolling shaft, fireproof cloth and a traction rod, a fireproof air bag structure composed of a first air bag and a second air bag is arranged in the sealing frame, and top-side-bottom three-dimensional sealing can be formed. According to the method, rapid unwinding of the fireproof cloth is achieved through electric driving, and an air bag is inflated to complete all-dimensional sealing; when power is cut off or the motor breaks down, the pull rope is pulled down to separate the transmission assembly, and the fireproof cloth is manually unwound through the gravity of the traction rod. Positive pressure smoke prevention is replaced by physical sealing, the smoke prevention device is free of chimney effect and wind interference, gets rid of power dependence, is simple in structure, convenient to maintain and stable and lasting in smoke prevention efficiency, effectively guarantees safety of the refuge storey, and is suitable for various high-rise building refuge storey elevator halls.

The invention discloses a vehicle base shaft chimney effect intelligent combined ventilation system based on upper cover development, which belongs to the technical field of vehicle base ventilation, and comprises mechanical ventilation equipment, a pre-value analysis module, a region division unit, a shaft communication analysis module, a combined control module and a machine communication control and regulation unit. A combined judgment value is obtained by comprehensively analyzing and calculating a total flux value and a basic ventilation judgment value, whether mechanical ventilation is started or not is determined according to comparison of the combined judgment value and a combined judgment threshold value, and flexible control is performed by a mechanical ventilation control and regulation unit after mechanical ventilation is started. The efficiency of matching mechanical ventilation adopted by the vehicle base with natural ventilation of the building vertical shaft is higher, the energy consumption of a mechanical ventilation system is further controlled, and the electric energy consumption is reduced.

This invention provides an intelligent prediction method and system for village fire spread paths, relating to the fields of fire science and computer physics simulation technology. The invention acquires three-dimensional spatial topological data and meteorological parameters of the village; through a street-valley and chimney effect coupled simulation module, combined with alleyway aspect ratio, slope, and wall roughness, it quantifies the wind field variation vector and spontaneous suction air volume under narrow terrain; through a multi-source fire leap-forward extrapolation module, it constructs a dynamic model covering fire generation, micro-topographic lift correction flight, and physical constraints of triggering conditions, extrapolating the coordinates of secondary fire jump points and filtering false fire alarms; through a radiation feedback and dynamic prediction module, it calculates the superposition of heat radiation from multiple reflections within the building angle to assess the risk of premature spontaneous combustion, and performs adaptive path replanning based on the monitoring logic of meteorological deflection and building collapse abrupt changes. This invention objectively recreates the discontinuous fire spread process at the microscale, improving the timeliness of prevention and rescue decisions.

This invention relates to a foundation wall structure suitable for EPS board thin-plastered exterior wall insulation systems. The purpose is to address the problems of existing building walls being prone to chimney effects and insulation layer detachment during fires. This invention's foundation wall structure is constructed from multiple masonry blocks; each cavity of a block is fitted with a cover plate, and support strips are positioned between upper and lower blocks. By incorporating a horizontal annular flange and cover plate in the center of each cavity of the block, the resulting cover plate vertically isolates airflow, preventing the chimney effect caused by vertically connecting the channels of the building blocks, thus improving the fire resistance of the exterior wall insulation system. The support strips support the EPS insulation board and corresponding fixing components, providing support and increasing the connection strength between the foundation wall structure and the EPS insulation board, reducing the risk of insulation layer detachment.

The invention discloses a pumped storage power station high-fall cable tunnel fire characteristic analysis system, and the system comprises a reduced-size cable tunnel which is used for placing a cable and is internally provided with a movable fireproof separation plate for adjusting a fireproof interval; the hydraulic mechanism is arranged below the reduced-size cable tunnel at a tunnel slope; the data acquisition module is used for acquiring fire characteristic parameter data generated in the cable combustion process when the tunnel is at different fireproof intervals and gradients; the data analysis module is used for performing dynamic inversion of the cable fire spreading process based on the fire characteristic parameter data; the comparison and verification module is used for comparing the test result with the fire prediction model to verify the model; the fire protection effect evaluation module is used for evaluating fire protection effects of different gradients and fireproof intervals by adopting an entropy weight method; according to the invention, cable fire spreading characteristics and smoke flow characteristics under the influence of chimney effect in cable tunnels with different gradients, and smoke flow characteristics and self-extinguishing characteristics in a high-fall closed cable tunnel are simulated and analyzed.

The utility model discloses a device for adsorbing dust by utilizing static electricity in a chimney. The device comprises a lower spraying and flushing pipe, a lower supporting piece, a lower flue gas guide plate, an annular roll control plate, a filler dust collection ball, a flue gas baffle, an upper flue gas guide plate, an upper supporting piece, an upper spraying and flushing pipe, a tower body, a fixing frame, a flue gas inlet pipeline and a flue gas exhaust pipeline, the inner wall of the tower body is fixedly connected with a flue gas baffle, the flue gas baffle is fixedly connected with a lower flue gas guide plate and an annular coil control plate, a filler dust collection ball is arranged between the lower flue gas guide plate and the annular coil control plate, and the top end of the lower flue gas guide plate is provided with an upper flue gas guide plate; the device is placed at the uppermost end of the desulfurization tower, the chimney effect is fully utilized, the natural rising force of flue gas is enhanced by utilizing the air flowing phenomenon caused by the temperature difference of air inside and outside a chimney, and therefore the wind resistance of a flue is greatly reduced, energy consumption is reduced, and the overall efficiency of a flue gas emission system is improved.

The present application belongs to the field of building technology, and particularly relates to a manhole with natural lighting and natural ventilation functions, and a construction method of the manhole. The manhole comprises a PC lighting cover, a stainless steel connecting piece, a sealing strip, a rotating shaft, a galvanized steel plate base, a right-angle pressing strip, a knob switch, a square steel tube, a hydraulic support rod and a connecting steel plate. The PC lighting cover is connected with the stainless steel connecting piece, and the stainless steel connecting piece is connected with the galvanized steel plate base through the rotating shaft. The manhole has the following advantages: (1) the chimney effect is utilized, and indoor dirty air can be discharged without consuming electric energy, so that natural ventilation is realized; (2) the PC lighting cover is dome-shaped, has strong anti-impact capacity and can realize self-cleaning function; and (3) natural lighting can be realized due to the diffuse reflection principle of the PC diffusion plate, and the light is uniform and soft, so that direct strong light and glare are avoided.

The application provides a fireproof system and a high-rise building fireproof method, and relates to the technical field of fireproof systems.The fireproof system comprises a liftable protection unit, a driving unit, a detection unit and a control unit, realizes early automatic detection and rapid response of a building outer facade fire, moves the liftable protection unit to above a fire source along a guide rail through control, starts a wind power generating part to generate downward airflow, can form a wind pressure barrier on a spreading path, effectively interferes and suppresses upwardly rising flames and high-temperature smoke gas due to a 'chimney effect', delays vertical spreading of the fire along an outer wall, not only saves valuable time for vertical evacuation of people in the building and transfer to a roof platform, reduces escape risks, but also creates more favorable conditions for rescue of external fire fighting forces, and improves active protection ability and overall safety resilience of high-rise buildings in response to such fires.

The application provides a power distribution network operation state multi-dimensional analysis and management and control method, comprising: obtaining external surface temperature distribution data from each area of a switch cabinet wall, obtaining airflow flow rate and flow direction information from a bus gap, simultaneously collecting temperature window inner wall and outer wall temperature data, and obtaining real-time airflow field distribution characteristics; evaluating the chimney effect strength level of a three-phase bus vertical arrangement area according to the real-time airflow field distribution characteristics, and determining the thermal superposition interference area range affected by the chimney effect in combination with the temperature window inner wall temperature data; performing sliding regression fitting on the accurate joint temperature estimation value according to a time window, and generating an overheating point positioning alarm signal when the change rate of the temperature abnormal rise trend exceeds a preset safety upper limit in a plurality of continuous sampling periods.

The utility model relates to the technical field of fire escape training equipment, in particular to a building fire smoke simulation model which comprises a plurality of building bodies which are sequentially stacked from bottom to top, each building body comprises a floor, side walls and an outer wall, the side walls are arranged at the two ends of the floor, the side walls are hinged to the floor, and the outer wall is hinged to the floor. Outer walls are arranged on the two sides of the floor. A partition plate and a partition wall are vertically arranged at the top of the floor, evacuation stairs are arranged on the outer side of the partition plate, and a fireproof door is hinged to the partition plate. A room partition wall is arranged between the partition wall and the outer wall, and an emergency door is hinged to the partition wall; an L-shaped partition plate is further vertically arranged at the top of the floor, and a smoke exhaust channel is formed by a space defined by the L-shaped partition plate, the partition plate and the partition wall. The device is convenient to disassemble and assemble, so that the device is convenient to carry; by simulating smoke, audiences can intuitively know fire smoke spreading and chimney effect characteristics in a building, and the functions of a fireproof door and a mechanical smoke exhaust facility in a fire can be known.

The utility model belongs to composting equipment technical field provides a kind of unpowered ventilation composting device, including first composting box, first composting box is fixedly connected with inclined plate in, and inclined plate and first composting box form composting chamber between, and first composting box is provided with the air inlet assembly that communicates with composting chamber;Second composting box, vertical fixed connection has chimney component in second composting box, the air inlet end of chimney component is located in second composting box, the air outlet end of chimney component is located at the outside of second composting box, length adjusting piece is provided in chimney component, length adjusting piece is used to adjust the distance between the air inlet end and air outlet end of chimney component, between second composting box, first composting box, it is obliquely provided with several ventilation components, and the low end of ventilation component communicates with composting chamber, and the high end of ventilation component communicates with second composting box inside.The utility model is based on chimney effect and temperature difference drive, improves the air flow speed in unpowered ventilation composting device and improves ventilation stability.

The application discloses a vehicle base vertical shaft chimney effect intelligent combined ventilation system based on an upper cover, belongs to the technical field of vehicle base ventilation, and comprises a mechanical ventilation device, further comprises a pre-value analysis module, a regional division unit, a shaft ventilation analysis module, a combined control module and a machine ventilation control and adjustment unit. The combined judgment value is obtained by comprehensively analyzing and calculating the total flux value and the base ventilation judgment value, whether to start the mechanical ventilation is determined according to the comparison between the combined judgment value and the combined judgment threshold value, and the machine ventilation control and adjustment unit is used for flexible control after the mechanical ventilation is started, so that the efficiency of the mechanical ventilation used in the vehicle base and matched with the natural ventilation of the building vertical shaft is higher, the energy consumption of the mechanical ventilation system is further controlled, and the electric power energy consumption is reduced.

The invention relates to the technical field of photo-thermal power generation, and particularly discloses a cooling method of a heat absorption tower and an air cooling heat absorption tower. According to the method, intelligent conversion from traditional air cooling constant air volume to on-demand air supply is achieved through intelligent control driven by temperature difference, a system monitors in real time and makes full use of the natural chimney effect, and only when natural ventilation is insufficient, the air cooling effect is achieved. Therefore, the invalid operation time and the power consumption of the fan are reduced to the maximum extent, and the power utilization rate of a power station is remarkably reduced. Meanwhile, a closed-loop automatic control system based on real-time temperature difference feedback can accurately respond to changes of power station loads and environmental conditions, stable and sufficient cooling air volume is provided for dead steam condensation all the time, and reliable operation of a cold end system is guaranteed. Due to high automation control, complexity and uncertainty of manual intervention are reduced, and the intelligent management level and operation stability of the whole power station are improved.

This application relates to a European-style transformer substation chimney-type heat dissipation top cover, belonging to the technical field of power equipment heat dissipation. It includes a top cover body, with a ventilation mechanism at the top of the top cover body. The ventilation mechanism includes two fixed frames, the bottom ends of which are fixedly connected to the top of the top cover body. A waterproof cover plate is fixedly connected to the top of each fixed frame. A ventilation fan is fixedly connected inside each fixed frame. A ventilation opening is provided between the fixed frame and the waterproof cover plate. A reinforcing assembly is provided at the bottom of the top cover body, including multiple vertical fixing plates, the external parts of which are fixedly connected to the bottom of the top cover body. The advantage of this application is that the ventilation mechanism at the top of the top cover combines a chimney-type structure with a ventilation fan. When the transformer substation generates heat during operation, the fan drives air to flow upwards through the ventilation openings, utilizing the chimney effect to accelerate the discharge of hot air.

The invention discloses an intelligent electric fireproof roller shutter device suitable for a high-rise housing. The intelligent electric fireproof roller shutter device is mainly composed of an outdoor detector, an Internet of Things module and an indoor fireproof roller shutter device. The outdoor detector is composed of an A1 type temperature sensing fire detector and a CO detector and can trigger sound-light alarm in a linkage mode. The indoor fireproof roller shutter device comprises a rolling shaft, a T-shaped aluminum alloy frame, a steering engine, high-silica fireproof cloth, an L-shaped rail and an anti-swing hammer strip. Real-time processing and instruction transmission of fire signals are achieved through the Internet of Things module, and the fireproof roller shutter device automatically descends the high-silica fireproof cloth to block fire and smoke. A double-detector linkage mechanism is adopted, the A-level refractory material and an intelligent control system are combined, the fire response speed and isolation efficiency are remarkably improved, and harm caused by the chimney effect in the high-rise building fire is effectively reduced.

The invention belongs to the technical field of power transmission and transformation projects, and particularly relates to an automatic temperature control structure suitable for a transformer substation, which comprises a temperature measuring device and a transformer substation roof. Wherein the temperature measuring device is arranged on the inner side wall of the transformer substation and is used for detecting the temperature in the transformer substation; meanwhile, a window is formed in the transformer substation roof, a structural beam and a displacement device are arranged in the transformer substation roof, and the top of the displacement device is connected with and supports the tempered glass window; and the temperature measuring device is electrically connected with the displacement device. When the temperature measuring device detects that the temperature in the transformer substation exceeds a preset threshold value, the temperature measuring device transmits information to the displacement device, and the displacement device can enable the tempered glass window to move horizontally and / or vertically, so that the window is opened, the chimney effect is formed, indoor air convection is enhanced, and the temperature control effect is achieved.

A light fixture that utilize multiple sheets of MCPCB for reduced costs, weight, and thermal, mechanical, and / or optical controls. In other embodiments, a heat sink may be formed by extruding a block of material to form a heat sink that utilizes a venturi and chimney effect, which may include attached MCPCB. Specific embodiments may utilize a plurality of MCPCB sheets or other pliable materials, which may be mirrored over a central axis or an extruded heat sink to create an open upper surface with a chimney effect

The present application relates to the technical field of photo-thermal power generation, and specifically discloses a cooling method of a heat absorption tower and an air-cooled heat absorption tower. The present application realizes the intelligent transformation from the traditional air cooling "constant air volume" to "on-demand air supply" through the intelligent control of temperature difference driving, and the system monitors in real time and fully utilizes the natural chimney effect. Only when the natural ventilation is insufficient, the fan starts to compensate, thereby minimizing the invalid operation time and power consumption of the fan, and significantly reducing the power station auxiliary power rate. At the same time, the closed-loop automatic control system based on real-time temperature difference feedback can accurately respond to the changes of power station load and environmental conditions, always providing stable and sufficient cooling air volume for the exhaust steam condensing, and ensuring the reliable operation of the cold end system. The high degree of automatic control reduces the complexity and uncertainty of manual intervention, and improves the intelligent management level and operation stability of the entire power station.

The utility model belongs to the technical field of earthen archaeological site protection, and particularly discloses a cultural relic archaeological site body humidity control device based on a chimney effect, which comprises a double-layer glass curtain wall arranged around an earthen archaeological site, an exhaust dehumidification pipeline system arranged in an earthen archaeological site foundation and matched with the double-layer glass curtain wall, and a ceiling matched with the double-layer glass curtain wall, the double-layer glass curtain wall comprises an inner-layer glass plate and an outer-layer glass plate, and an air cavity is formed between the inner-layer glass plate and the outer-layer glass plate. The exhaust dehumidification pipeline system comprises a pipeline net rack communicated with the air cavity; by means of the chimney effect formed by the fact that air in the air cavity in the double-layer glass curtain wall rises after being heated, moist air in the earthen archaeological site is guided to flow into the exhaust pipeline at the bottom of the earthen archaeological site foundation along the exhaust hole and then is exhausted out of the earthen archaeological site ceiling along the air cavity, the moist air in the earthen archaeological site can be exhausted, and the earthen archaeological site is protected. The purpose of automatic air exhaust and dehumidification in the earthen archaeological site environment is achieved.

The application discloses a kind of houses air conditioning control systems combined passive energy-saving mechanism, specifically relates to energy saving and air conditioning control field, including acquisition analysis module, over-limit air supply module, fall stop module, dynamic heat release module and coordination switching module;Acquisition analysis module is by collecting the indoor temperature data at indoor exhaust port and the underground air temperature and humidity data at underground fresh air inlet, the trend analysis result is generated by combining the collected data with historical temperature curve and solar radiation change trend, and the prediction result of future over-limit or fall of room temperature is solved based on trend analysis result;The scheme introduces trend prediction and determination logic, and combines the passive adjustment path of underground air circulation, phase change heat storage unit and chimney effect, to realize the cooperative operation of feedforward control and feedback correction in each module, to solve the problem of regulation delay and energy consumption amplification caused by sensing lag and execution inertia.

The invention discloses a super high-rise building chimney effect regulation and control method and system based on cold air drainage, and relates to the technical field of building physics. In the heating season, the internal temperature and the outdoor temperature of a large-stroke shuttle elevator shaft are collected in real time; when the outdoor temperature is higher than the preset temperature, all the holes are closed; when the outdoor temperature is lower than the preset temperature and the indoor and outdoor temperature difference is smaller than 8 DEG C, all holes are closed; when the outdoor temperature is lower than the preset temperature and the indoor and outdoor temperature difference is larger than 8 DEG C, all holes are opened, outdoor cold air enters the large-stroke shuttling elevator shaft and is mixed with hot air in the large-stroke shuttling elevator shaft, the air temperature in the large-stroke shuttling elevator shaft is reduced, and the hot pressure difference generated by the temperature difference is weakened; and the pressure difference delta P of the elevator landing door does not exceed 65Pa. According to the invention, drainage of cold air is realized, so that the problem of chimney effect caused by temperature difference is effectively reduced. And therefore, the situation that the elevator door cannot be normally opened and closed is reduced, and the safety and normal operation of the elevator are guaranteed.

The invention provides a distribution box for outdoor cable laying, and particularly relates to the technical field of distribution boxes, the distribution box comprises a main box body, the top of the main box body is provided with a top cover, the bottom of the main box body is provided with at least three wire inlet bottom holes, and lower convection holes are symmetrically distributed in the positions, close to the bottom, of the two sides of the main box body; according to the distribution box for outdoor cable laying, a flow guide channel for guiding the convection mechanism is utilized to change the airflow speed through the gradual change design of the cross section, and the graphene heat conduction coating on the inner wall is matched to quickly transfer element heat, so that the heat transfer efficiency is improved, and the heat transfer efficiency is improved. The Venturi effect accelerates airflow and the chimney effect strengthens air exchange, so that the heat exchange efficiency in the main box body is greatly improved, the problem of performance degradation caused by insufficient heat dissipation of elements in the distribution box in an outdoor high-temperature environment is effectively solved, and safe operation of cables in the distribution box is ensured.

A passive heat dissipation case with a variable heat dissipation air duct comprises a case body, a containing partition plate is arranged in the case body, the interior of the case body is divided into an upper space and a lower space by the containing partition plate, and the passive heat dissipation case has the functions of delaying heat transfer, blocking dust invasion and dividing the space to form negative pressure while bearing the carrier function; in conclusion, the heat dissipation environment can be changed according to the use condition of the case, when efficient heat dissipation needs to be provided, the heat dissipation fan is started, negative pressure air draft is conducted, hot air flow is exhausted outwards in an accelerated mode through the fan by means of a chimney air channel on the inner heat dissipation plate, when noiseless passive heat dissipation is needed, the first blocking strip shields the active heat dissipation opening, the magnetic attraction heat dissipation fan is removed, and the heat dissipation efficiency is improved. Hot air flow is discharged outwards from the inner heat dissipation plate and the outer heat dissipation plate by utilizing the chimney effect; in addition, a hollowed-out support, heat dissipation ribs and an ultra-thin VC vapor chamber are further designed, so that the heat dissipation performance of the case is further improved.